Air preheater for oil burners



A. T. JOHANSON AIR PREHEA-TER FUR OIL BURNERS Aug. 23

Filed May 21. 1924 l .air to the gases after they P at enter] Aug. 1927.v I

- UNITED, STATES.

PATENT, OFFICE.

AIDOIIPE T. JOHNSON, OI CHICAGO, ILLINOIS, .ASSIGNOB T MILTON E. PAGE,J'B.,

ADQIAPE T. JOHANSON, AND CHRISTOPHER M. FACE, ALL 01' CHICAGO, ILLINOIS,AS TRUSTEES FOB AABALL MANUFACTURING COMPANY, A COMMON LAW TRUST.

' AIR PREHEATER FOB OIL IB'UIB'NEBS.

Application a Kay :1, i924. Serial No. 714,750.

This invention pertains to improved and novel neans for supplying air toa burner, such as anoil-burner, and preferably, but not restrictedly,one-0f the rotary ty e,

-5 wherein the fuel mixed with air is ischarged under the action ofcentrifugal force in consequenceofwhich the fuel is well subdivided andintermixed with the air.

The present improvement relates more particularly to means for supplyingheated burner, and of course before they have been wholly consumed.

The air is not only heated by the new structure but the furnace as awhole is protected from becoming induly or inefliciently heated and thefuel is burned more effectively and economically. 7 One aim and purposeof the invention is to "provide a construction of this character whichis simple in structure, which is economical to produce, which maybeeasily installed and removed from the furnace, and

' which performs its functions in a 'satisfac-- tory and approvedmanner. Y To those acquainted with this art to ful y understand theinvention, both from structural and functional standpoints, in theaccompanying drawing forming a part of this specification, I haveillustrated a furnace e nipped with one of the new structures, t esingle view of the drawing being a central vertical section offragmentary character. 1

In other words, the picture presents only a portion of the furnace butis suflicient for the purposes of illustrating the particular inventionin question.

The furnace of this illustration may be 'of any usual or suitabledesign, but in the present instance, I have 'de icted .a simple one ofupright, cylindrical orm having an outer, doub e-wall water-jacket 10.Inside of suchfurnaceand bearing onan appropriate base or foundation,not shown, are a plurality (three in the. present instance) of uprightposts or legs 11, 11 resting on which' is a dish-shaped metal shell 12-desirabl made in a p urality of sections fbolte together at 13.

f Near the ofits outside curved surace,

standing flange 14 provided for thepm'pose ave left the vthe margin ofthe such shell or wall member has an out-' upright annular passage ofsupporting a horizontal ring or annular plate 15 closing the spacebetween the round member 12 and the inner wall of the'encasing orenclosin water-jacket.

' The top of t e ring plate 15 is covered with any suitableheat-insulating material 16 such as fire clay or its equivalent.

' At its center, this upper shell, or wall member has a round aperture17 and out- 1 wardly beyond the margin .of this hole, the curved platehas an annular depression 18 adaptedto catch any oil from theburner anddrain it away by means not shown.

a A smaller, dish-shaped shell or wall member 19, made in sections ifdesired, is supported from the upper member 12 and spaced below thelatter by means of screws 20, 20 fastening the parts togetherand'extended through apertured spacing lu r 21 risin from the top I faceof such ower mem r.- a

As is clearly shown, this lower, depending shell or wall is of lessdiameter than its companion or complementary up er shell or wall, butthis need not necessari y be so as will be readily appreciated.

These cooperating upper and lower shells or walls are disposedconcentrically and the under one has register with, but of less sizethan, the corresponding aperture in the upper member.

An annular or circular ring-member 23 has a flange 24 outstanding fromits lower "margin, the outer part thereof resting on the lower shell,the undersurface of such flange conveniently and desirably having acircular head or ri 25 to maintain the member 23 in central plosition byeoaction with ole" 22. The upright cylindrical wall of the mam body ofthe part 23' is of appreciably less diameter-than thatof the holes orapertures 22 and 17 and it extends or pro ects up through the hole 17and some distance above it, its top having an outstanding, horizontal,circular flange 26 of a diameter substan ally ter'than that of the oning 17. 'l hus it will be observe that these three associated elements12 19 and 28, the lat ter with its u per and lower flanges, form acircular, I ownwardly-directed passage between the two shells which101118 with an through the apera central round hole 22in v ture 17formed by thebody 28 and hat such 1 v generalpail shape, and has a topcover plate 29 spaced slightly above its upper,

circular edge forming a round discharge no'zzle or orifice 30.

The liquid fuel, such as oil, is fed up into the burner in anyconvenient and satisfactory mannerthrough the bore of shaft 28 which ishollow, and air is admitted into the interior of the burner to mix withthe fuel through the perforations 31 in its bottom wall. e

The particular structural characteristics of this burner form no part ofthe present invention except to the extent in which the air is suppliedthereto to carry on the combustion of the fuel.

Another supply of air flows up through the ring 23 around the burner andmixes directly with the mixture delivered through its-round dischargeopening, as soon-as such delivery occurs.

As the partially-consumed mixture travels outwardly away from therapidly revolvingv burner from which it is expelled under the action ofcentrifugal force, it becomes intermixed with the heated air which flowsup through the tortuous conduit previously outlined formed by the twdshells and the ring member, such air abstracting heat from the metalparts withwhich, it comes in contact, thus desirably being raised intemperature and maintaining the elements of the furnace from becomingunduly heated.

It will be understood, therefore, that the burner has three supplies ofair, one directly into the burner itself, a second immediately outsideof and adjacent to thedischarge opening of the burner, and a third-atsome distance from the burner, such arrangement of arts bringing aboutsuch distribution of t e air assuring a complete and. eficientcombustion or consumption of the fuel.

The several elements of the structure are so made and associatedtogether that they can be readily and easily installed .in a furnace andthey 'can also be removed with facility and dispatch.

The ring member can be lifted up or withdrawn through the hole in theupper shell, and the two shell members may be put in place or taken outwithout difliculty or loss of time.

Many minor mechanical changes ma ted and upright'le an upper centrdescribed without departure from the substance and. essence of theinvention as defined by the appended claims, or, stated somewhatdifferently, the invention is susceptible of a variety of embodimentsdiflering somewhat in structural characteristics,

but all incorporating the fundamental prinspaced inwardly away from themargin of the aperture of said upper shell, and having anoutwardly-extended flange above said upper shell, and a fuel-burnerhavinga discharge opening above said ring, whereby air flowing inwardlybetween said shells is caused to flow upwardly and outwardly above saidupper shell where it mixes with the gases issuing and at some distancefrom i said burner, such air being preheated by said shells during itspassage through the conduit specified.

2. In a construction of the character .described, the combination of aplurality of upright legs, an upper centrally-apertureddownwardly-dished shell resting and supported on said legs, a secondlower, cen-' trally-apertured downwardly-dished shell spaced below andsup orted from said upper shell, a ring inside '0? the apertures of saidshells supported on said lower shell, spaced inwardly away from the marin of the aperture of said upper shell, and aving an out--wardly-extended flange above said upper shell, a fuel-burner having adischarge opening above said ring, means to admit air to the interior ofsaid burner, and -means.,to

admit air between the burner and said ring to commingle with the ases asthey issue from the burner, where y air flowing inupper shell where itmixes'with the gaseslssuing and at some distance from said burner, suchair being preheated by said shells durin its passage through the conduits ecified. a

3.. n a construction of the character dc-- scribed, the combination ofail-plurality of v y-apertured downwar y-dished shell resting andsupported on said-1e s, a second lower, centrally-a rturedownwardly-dished shell s aced low and supported from said upper s ell, aring inside of the apertures of said shells, supported on said lowershell, spaced inwardly away from the margin of the aper- I ture of saidupper shell, and having an outing inwardly between said shells is causedwardly-extended flange above said upper to flow upwardly and thenoutwardly above shell, a fuel-burner having a dischargevopensaid uppershell where it mixes with the ing above said ring, means to admlt air togases issuing and at some distance from said the interior of saidburner, whereby the air burner, "such air being preheated by saidflowing inwardly between the shells is shells during its passage throughthe concaused to flow upwardly and then outwardly du'it pecifi d,

above said upper shell where it mixes with 5; In a, structure of thecharacter dethe gases issuing and at some distance from scribed, thecombination of an upper shell said burner, such air being preheated byhaving an aperture therethrough. a lower said shells during 1ts passagethrough the shell s aced downwardly away from said 40 conduit specified.upper shell having a smalleraperture there- 4. In a construction of thecharacter dethrough in register with said upper aperscribed, thecombination of a plurality of ture, a hollow ring member having an out-4 upright legs, an upper centrally-apertured standing flange of lesssize than said upper downwardly-dished shell resting and supt re ndresting o said lower shell ported on said legs, a e ond 10w r around themargin of its aperture and havtrally-apertured downwardly-dished shelling also an outstanding deflector flange.

s aced below and supporte fr m Said ppe above and of greater size thansaid upper s ell, a mug mslde o the apertures of said tu e, and a burnerhaving its discharge shells, supp r d n said lower h spaced orificeabove said deflector flange, said shells inwardly away from the marginof the aperand ring member forming an air preheatture of said uppershell, and having an outing conduit which delivers its air to thewardly-extended deflector above said upper gases issuing from and atsome distance outshell, arotary fuel-burner having a discharge wardlyfrom said burner orifice.

opening above said ring, and means to admit In witness whereof I havehereunto set air between said burner and said ring to my hand. unitewith the gases as they immediately issue from the burner, whereby theair flow- ADOLPH T. J OHANSON.

